Grinding wheel dressing apparatus



Sept. 1, 1959 Filed May 25, 1956 I N. HOGLUND GRINDING WHEEL DRESSINGAPPARATUS 6 Sheets-Sheet 1 INVENTOR. /V/Ls HUELA/A/ T TOIPA/E Y Sept. 1,1959 N. HOGLUND 2,

. GRI'NDING WHEEL DRESSING APPARATUS Filed May 25, 1956 6 Sheets-Sheet 2IN VEN TOR. /L s /7 L7EL L/NU ,7 OlF/VEY N. HOGLUND GRINDING WHEELDRESSING APPARATUS Sept. 1, 1959 6 Sheets-Sheet 3 Filed May 25, 1956INVENTOR.

M45 #1754 u/vo BY TOE/V57 Sept. l,v 1959 Filed May 25, 1956 N. HOGLUNDGRINDING WHEEL DRESSING APPARATUS 6 Sheets-Sheet 4 INVENTOR. /4sfi/aaLu/va Sept. 1, 1959 Filed May 2 5, 1956 6 Sheets$heet 5 v1 mw w m UM H J 5 M N Y 'r B M Q 3 mm mm v 7/// N. HOGLUND GRINDING WHEEL DRESSINGAPPARATUS Sept. 1,- 1959 6 Sheets-Slieet 6 Filed May 25, 1956 INVENTOR./V/. .5 H4754 L/A/D BY J I 5 20mm United States Patent GRINDING WHEELDRESSING APPARATUS Nils Hoglund, Summit, NJ.

' Application May 25, 1956, Serial No. 587,357

15 Claims. (Cl. 125-11) My invention relates to contour-formingapparatus, more particularly to improvements in contour grinding wheeldressers.

In certain types of grinders for dressing b-all race grooves and sealgrooves on ball bearings and some other applications of this type it isnecessary to provide complex contours on the grinding wheel where one ormore radii are needed to an accuracy of 20 millionth of an inch orbetter.

It is the principal object of my invention to provide an improvedcontour forming apparatus or wheel dresser capable of forming complexcontours where one or more radii are needed and with an accuracy ofrnillionths of an inch.

It is another object of my invention to provide such a contour-formingapparatus or wheel dresser in which the dressing tool can be made tomove parallel of the axis of the wheel being dressed as well as radiallyand also in which the tool may be made to move through an arc eitherwhile the tool support or dressing housing is stationary or moving.

Briefly, in accordance with my invention, I provide a support adapted tobe fixed to the grinding wheel apparatus and having mounted on it aslide guide. A dresser slide mounted on this slide guide in turnsupports a bracket extending normally thereof and having thereon a slideguide for slidably supporting a housing on which the diamond or dressertool is mounted and which carries the various slides, cams, followers,prime movers, and controls. The housing is in efiect a three compartmenthousing in one of which is slidably mounted a slide carrying the contourand feed cams for controlling movement of the housing and the toolslide. The feed cam controls movement of the housing in a directionparallel to the axis of the wheel being dressed. The contour feed camdetermines the movement of the dressing tool in a radial direction. Thiscontour and feed cam slide also carries a plurality of trippers whichoperate control switches within the housing in a predetermined order asthe slide moves within the housing. These switches control certaincircuits which, in turn, control the solenoid operated valves of a fluidoperated piston connected to and moving said slide.

In another portion of the housing I mount a tool slide which carries atits outer end a yoke within which is mounted the pivoted tool support.

Mounted on the tool support is another housing containing a bell crankconnected to the rotatable tool support and has movement between twopositions for rotating said tool support. Switch members within thehousing are operated at these positions and control the rotation of thetool support as well as movement of the housing parallel to the axis ofthe wheel being dressed by controlling the solenoids of the variousvalves which, in turn, control the fluid to the two fluid operatedpistons.

With the ratio and cam slide in one position and the housing at one ofits terminal positions, a starting button initiates movement of theslide carrying the feed cam and 2,902,025 Patented Sept. 1, 1959 contourcam to cause movement of the housing parallel to the axis of the wheelbeing dressed. The tool slide during this operation moves radially orremains fixed with respect to the housing to form the contour on thedressing wheel until an intermediate portion of the wheel is reached. Atthis point, the controls stop movement of the housing and initiatemovement of the rotatable tool through an arc. The housing is thencaused to continue movement to its terminal position. At this positionthe controls stop all movement of the housing and tool. The reverseaction can be brought about by again operating the starting button.

Other objects of the invention will appear in the following descriptionwith reference to the drawings, in which:

Fig. 1 shows a front perspective view of apparatus made according to myinvention with the housing covers removed to show details ofconstruction;

Fig. 2 is a perspective taken from the rear of Fig. 1;

Fig. 3 is a plan view of apparatus made according to my invention withparts broken away to show details of construction;

Fig. 4 is a side elevation of Fig. 3 with parts broken away to showdetails of construction;

Fig. 5 is a section taken along the line 55 of Fig. 3;

Fig. 6 is a section taken along the lines 66 of Fig. 3;

Fig. 7 is a circuit diagram showing the switches and controls for thefluid pressure operated pistons controlling the movement of the housingslides and tool supports; and

Fig. 8 shows the contour of the wheel being dressed.

General description Referring now to Figs. 1, 2, 3 and 4, apparatus madeaccording to my invention includes mounting plate base 10 supporting adresser slide 11 for permitting adjustment of the housing designatedgenerally at 12 radially relative to the surface of the wheel beingdressed. This housing is slidably supported on a slide guide to bedescribed and mounted on the bracket 11' extending normally to thedresser slide. The housing moves parallel to the axis of the wheel beingdressed. The housing is, in effect, a three-compartment housingcomprising the portion 13 in which the contour and feed cam slide aremounted, the portion 14 in which the diamond tool slide is mounted andthe portion 15 in which the intermediate slide is mounted. The contourand feed cam slide is connected to the fluid pressure operated piston43'.

Mounted on the outer end of the tool slide 55 is the tool support oryoke 17, rotatably supporting the tool support 17 carrying the dressingtool 19. Mounted on the yoke 17 is the auxiliary housing 20 in which ismounted the mechanism for rotating the tool support and the controlstherefore.

Briefly, as the housing moves along the supporting bracket 11' andparallel to the axis of the grinding wheel, the tool slide remainsstationary or is fed radially toward and from the wheel being dressed sothat the tool may cut the proper contour. As described above, thehousing may be stopped intermediate its terminal position and the toolrotated thru an arc to fonn the true radius or radii shown in Fig. 8.

Housing and support Referring now to Figs. 3, 4, 5 and 6, the apparatusmade according to my invention includes the mounting plate 10 having theslide guide 10. The dresser or housing slide 11 is slidably supported onslide guide 16 by ball bearing assemblies 25 and 26. The position of theslide 11 can be adjusted by means ofa lead screw, not shown, in order toadjust the position of the housing radially of the wheel being'dressed.

Slide 11 is provided with a supporting bracket 11 extending normallythereof and which, in turn, supports the slide guide 27. The housing 12is slidably supported on slide 27 by means of the ball bearingassemblies 28 and 29, the entire housing being biased to the right (Fig.or away from the viewer (Figs. 3, 4 and 6) by means of biasing spring 30which is mounted on the bracket 11 and connected to the housing 12 at31.

Mounted on the bracket 11 is a fixed follower pin carried in a slidableblock 36. The position of the block and pin and hence the position ofthe housing relative to the wheel being dressed is controlled by meansof the adjusting screw 21 freely rotatable in the bracket and connectedby screw thread to the block 36. As the screw is rotated, the pin movestoward the right or left (Fig. 5) permitting movement of the housingtoward the right or left. This determines the position of the housing 12along the axis of the wheel being'dressed.

Feed and contour cam slide Referring to Figs. 1, 2, 3 and 5, the portion13 of the housing 12 has received within it the slide which supports thefeed cam controlling movement of the housing and the contour camcontrolling movement of the dressing tool radially of the wheel beingdressed.

The feed and contour cam slide 40 is mounted on ball bearing assemblies41 and 42. It is connected to the piston rod 43 of the prime moverhydraulic cylinder 43: which includes a fluid pressure operated piston.The piston rod 43 is connected to the slide by means of the couplingcollar or split piston block 44.

The piston 43 is fixed to the housing and is fed with fluid underpressure by conduits 45 and 46 controls for which will be'describedbelow. The slide 40 can be made to move back and forth within thehousing as desired, carrying with it the feed and contour cams.

On the underside of the slide 40 is mounted the feed or ratio cam 58which has the shape shown. It is urged against the follower pin 35 bymeans of the spring 30. As the slide moves from left to right (Fig. 3),since the feed cam becomes narrower toward the right, the housing ismoved away from the viewer (Fig. 3) and toward the right (Fig. 5). Whenthe slide and feed cam move in the opposite direction, the housingmovement of course is reversed. This controls movement of the housingacross the wheel being dressed. During this movement of the housing thetool is also caused to be moved radially of the wheel being dressed andalso in an are at a predetermined point in the travel of the housingacross the surface of the wheel being dressed. This will be describedlater.

The contour cam 51 which controls the radial movement of the dressingtool 19 is mounted on the upper side of the slide 40. The means by whichit controls movement of the tool slide will be described below.

T001 slide Reference is now made to Figs. 1 to 5, inclusive. Mountedwithin the portion 14 of the housing 12 is the rectangular plate-likeslide 55 slidably supported on the ball bearing assemblies 56 and 57.This slide is urged to the right (Fig. 3) and toward the viewer (Fig. 5)by biasing spring 52 mounted in the housing portion 14 and secured toslide 55 (Figure 4) at 53. Supported on the outer end of the slide 55 isthe yoke 17. The rotatable tool support 17 supporting the tool 19 ismounted in the yoke. A flexible dust cover 17 is connected between theyoke 17 and the housing part 14. This permits movement of the slide 55into and out of the housing but protects the part of equipment mountedwithin the housing. The tool support 17 is rotatably mounted in thebearings 59 and 60 supported by the yoke 17.

The intermediate or cam follower slide 75 mounted in the portion 15 ofthe housing is slidably supported in ball bearing assemblies 76 and 77and is biased to'the left (Fig. 5) and toward the viewer (Fig. 3) bymeans of 4 biasing spring 78 secured to the slide 75 at 79 and mountedin the housing portion 15.

This slide '75 carries a contour cam follower 80 maintained in contactwith the contour cam 51 by the spring 78. The other end of the slide 75supports a follower pin 81 contacting the cam 81 fixed to the slide 55.Spring 52 keeps the cam 81 in contact with the pin 81. As theintermediate slide 75 moves back and forth, the pin 81 contacting thecam 81 causes the tool slide to move along its path of movement.

Mounted above the yoke 17 and supported thereon is the crank and controlhousing 20. In operation at a certain point in its travel the mainhousing 12 stops and the tool is rotated through an arc. To do this, Iconnect a crank 69 secured to the upper end of the tool support 17'.This, in turn, is connected to the piston rod 66 of a piston receivedwithin the cylinder 65, the piston being pivoted at 67 in the housingportion '20. Fluid under pressure is fed to the cylinder by means ofconduits 67 and 68. The stop 70 fixed to housing 20 limits the move mentof the crank and tool support. This stop extends up within the opening69 of the crank 69. The piston rod 66 carries a block 71 whichalternately contacts control switches 72 and 73. As will be explainedbelow, these switches control the rotation of the crank as well as themovement of the housing 12.

Controls To control movement of the housing and the rotatable toolsupport, various switches must be operated in apredetermined sequencefor controlling the fluid under pressure to the fluid pressure operatedpistons in cylinders 43 and 65. This is done by means of switchesmounted adjacent the path of travel of 'the feed and contour cam slideand the crank operating the rotatable or pivoted tool support.

The switches controlling rotation of the crank have been describedabove. For controlling movement of the housing, I mount within theportion 13 of the housing three control switches 85, 86, and 87 (Figure3) which are mounted adjacent the path of travel of the slide 51 and areoperated by means of the dogs 88,"89,and 90. These dogs are secured'tothe slide 51. Dog 88 controls operation of the switch dog 89'controlsoperation of switch 86; and dog 90 controls operation of the switch 87.These switches are supported in the member 13 fastened to the'housingportion 13. The switches in'housing 20 were described above.

Referring now to the diagram in Fig. 7, there are shown thesolenoids105, 106, 107 and 108 which controls the valves V and V in the conduitsconnected to the cylinders for permitting fluid under pressure to bedirected into the cylinders 43 and 65 in the proper direction.Associated with said solenoids are the relays F and R, and F and R Eachof these relays controls the contacts bearing the same symbol as therelay. The switches 72, 73, 85, 86, and 87 are those previouslyidentified. The starting switch 1% is connected toone side of the powerline. All of the switches are'shown in the position they normally assumewhen not in contact with eitherthe dogs on the feedand' contour slide orthe block on the crank. I

Referring to Figs. 3 and 7 and assuming slide 40 to be in the left-handterminal position (Fig. 3), thedog 88 will be in contact with andhave'caused the switch 85'to be moved to the contact connectedto R4 andaway from the contact connected to F1. (As shown in Fig. 3 the slide'isin its right-hand terminal position.) To start operation, the starterbutton switch 109 is moved to closed positionv This completes a'circuitthrough 'R4and the relay F causes contact F1 to open F2, F3' and F4 toclose.

Since F2 has also been closedand since theswitch 87 is closed, a holdingcircuit is provided through therelay F keeping it closed. Thisisnecessary since, when 'the slide 40 moves to the right as will bedescribed, switch 85 is disengaged by dog 88 and it returns to itsnormally closed position on the contact connected to F1 which at thistime is open.

When the contact F3 closes, it completes a circuit from one side of theline through the valve solenoid 105 closed contact R 4, closed contact F3 back to the other side of the line, thus energizing the valve andpermitting fluid under pressure to flow into the cylinder 43' to startmovement of the slide 40 toward the right.

The slide continues to move toward the right until it reaches anintermediate position. The switch 86 is contacted by the dog 89 closingthe switch. Since F4 is now closed and since contact R Z, switch 73 andcontact F4 are also closed, relay F A will be energized. Relay R is notenergized since the contact R1 is open. When the relay F is energized,contacts F l and F 3 are opened and contact RA is closed. When F 3opens, it opens the circuit through the solenoid 105 so that the slide40 comes to rest. It is understood that during this period the toolslide has been moving radially in accordance with the contour on thecontour cam 51 and the housing has been moved across the wheel beingdressed in accordance with the feed cam 50.

Since F 4 has been closed, a circuit is completed through the valvesolenoid 108 which controls the fluid being directed to the cylinder 65which controls operation of the crank 69. At this time block 71 is incontact with switch 72 and is holding it open. Then, while the housingremains stationary, the tool is pivoted through an arc. Switch 72, whichwas open because it was in contact with the block 71, closes when theblock moves away from the switch. However, since F 1 is open, nocircuits are completed. The piston of cylinder 65 continues to functionuntil the terminal position of the crank is reached, at which time theblock 71 contacts switch 73 to open the circuit through'the relay F Awhich then becomes de-energized. Contacts F I and F 3 close and contactF 4 opens. This de-energizes the solenoid 108 and stops further movementof the crank.

At this point the solenoid 105 controlling the movement of the contourand feed cam slide 40 to the right is again energized since a circuit iscompleted from one side of the line through F3 which is still closed, R4, which is closed, F 3, which is now closed, back to the other side ofthe line. Switch 86 is opened when the dog 89 moves out of contact withit. Movement of the housing and tool slide are then resumed. When theslide 40 reaches its terminal position at the right of the housing (Fig.3), dog 90 opens the switch 87 which deenergizes the relay P so that thecontacts F2, F3, and F4 open de-energizing solenoid 105 and stoppingfurther movement of the slide. However, contact F1 is reclosed; thusrelay R is in position to be energized when the button 100 is closed.

To reverse the process, button 100 may again be closed. This completes acircuit through the relay R since F1, switch 85 and switch 100 areclosed. R4 is opened, while R3, R2 and R1 are closed. A holding circuitfor relay R is completed through switch R3. This energizes the reversesolenoid 106, since a circuit is completed through R2, 106, R 4, F tothe other side of the line. This controls the reverse valve for thepiston 43 causing movement of the cam and feed slide 40 toward the left(Fig. 3). As it does so, dog 90 moves away from switch 87 permitting itto reclose, but since F2 is open, relay F is not energized. The slidecontinues its movement until the dog 89 re-engages the switch 86. Sinceswitch 72 is now closed, relay R is energized since F 1 and R1 areclosed. Contact R 3 is closed and contacts R Z and R 4 opened. Thisde-energizes solenoid 106 causing movement of the slide 40 to beinterrupted. However, since R 3 is closed, a circuit is completedthrough the solenoid 107 energizing fluid operated piston 65 and cansingrotation of the crank 69 and tool support 17'. 73

closes as block 71 moves away therefrom, but since R Z is open, nocircuit is completed. Rotation continues until switch 72 is opened byblock 71 and relay R deenergized. Contact R 3 opens de-energizingsolenoid 107 and stopping rotation of the crank and tool. R 4 and R Zreclose. This completes a circuit through the solenoid 105 thus againinitiating movement of the slide 40 to its terminal position. Swith '86opens when dog 89 moves out of contact with it. When the slide reachesits terminal position, dog 88 opens the Switch de-energizing relay R,thus closing contact R4 and opening contacts R1, R2 and R3. All elementsreturn to their normal position and further movement cannot be initiateduntil the switch is again closed.

From the above description it will be seen that I have provided anapparatus capable of performing the functions required and one which hasthe advantages pointed out above.

I claim:

I l. Apparatus for forming a contour on a grinding Wheel, said contourincluding at least one radius of curvature, including a supportingmember reciprocally movable in one direction, a tool support movablymounted on said supporting member for movement transversely of said onedirection, a tool mounted on said tool support and rotatable about avertical axis, means for moving said supporting member and said toolsupport, other means for rotating said tool and automatic controls forsaid last two means mounted on said supporting member and on said toolsupport for controlling movement of said supporting member and said toolsupports and rotation of said tool in a predetermined sequence.

2. Apparatus for forming a contour on a grinding wheel, including asupporting member reciprocally movable in one direction, a tool supportslidably mounted on said supporting member for movement transversely ofsaid one direction, a tool rotatably mounted on said tool support, meansincluding inter-connected slides and cams and a power unit for movingsaid supporting member and said tool support, other means including apower unit for rotating said tool controls for said last two meansmounted on said supporting member and said tool support and connected tosaid power units for controlling movement of said supporting member andsaid tool support and rotation of said tool in a predetermined sequence.

3. Apparatus for forming a contour on a grinding Wheel, including asupporting housing reciprocally movable in one direction, a tool supportslidably mounted on said housing for movement transversely of said onedirection, a tool rotatably mounted on said tool support, meansincluding inter-connected slides and cams and a power unit for movingsaid housing and said tool support, and other means for rotating saidtool and a power unit connected thereto and controls for said last twomeans mounted on said supporting member and said tool support andconnected to said power units for controlling movement of saidsupporting means and said tool slide and rotation of said tool in apredetermined sequence.

4. A contour forming apparatus including a supporting base member, ahousing movably supported on said base member for reciprocal movement inone direction, a first slide mounted on said housing and supporting atool for movement in an arc, said first slide movable transversely ofthe movement of said housing, a second slide on said housing, a contourcam and a feed cam mounted on said second slide, means connected betweensaid contour cam and said first slide for controlling movement of saidtool along a path transversely of the movement of said hous ing, meansfixed to said supporting base and contacting said feed cam forcontrolling movement of said housing along its path of movement, a primemover mounted within said housing and connected to said second slide, asecond housing mounted on said tool slide, means within said secondhousing for controlling movement of said tool through saidarc, andafirstcontrol means connected to; said prime moverandother control meansconnected toisaid' means formoving said tool through said arc, saidfirsttcontrol means controlling movement of said housing ir1 onedirection and-said tool-in'a transverse direction, and saidother-control means causing said housing to interrupt its movement alongits' path and for causing the movement of said 'tool through said areduring said interruption.

5. Apparatus for forming; a contour on a grinding wheel, including ,asupporting member movable along a path, a tool supportslidably mountedon said supporting member for movementtransversely of said path, a toolmounted on said toolsupportand rotatable about a vertical axis, meansincluding a powerunit connected to said supporting member for movingsaid supporting member and said toolsupport, and other means forrotating said tool support including a power unit connected thereto, andautomatic controls connected to said power units mounted on saidsupporting member and on said tool support for controlling movement ofsaid supporting member and said tool support along said pathinterrupting movement of said supporting member alongsaid path causingrotation of said tool from one terminal position to another and thencontinuing movement of said supporting member and said tool support toa, terminal position.

6. A contour forming apparatus including a tool-carrying slide, apivoted member mounted on said slide and supporting a forming tool formovement in an are, means connected to said pivoted member and mountedon said slide for controlling movement of the tool through said are, ahousing structure supporting said tool slide, a support slidablysupporting said housing structure for movement in one direction, meansfor moving said housingin said one direction including a slideand aprime mover connected to said slide, means connected between saidsupport and said slide for controlling movement of said housing, andother control means connected to said prime mover and within saidhousing for controlling movement of said housing and said tool slide.

7. Apparatus for forming. a contour on a grinding wheel, said contourincluding at least one radius of curvature, a housing slidably mountedon said. supporting member for movement alonga path, a tool support,means on said housing rotatably supporting said tool support andmovablein a direction transversely of the movement of saidhousing, meanswithin said housing and connected to said supporting member forcontrolling movement of said housing and said tool support, and othermeans mounted'on-said tool support for controlling movement of said toolthrough an arc.

8. A contour forming apparatus including a supporting member, a housingslidably mounted on said supporting member for movement along a path, atool support, means on said housing ,for rotatably supporting said toolsupport and movable in a.direction transversely of the movement of saidhousing, means within said housing and connected to said supportingmember for controlling movement of said housing and the supporting meansfor said tool support, and other means mounted on said tool support forcontrolling movement of saidtool support through an are, an electriccontrol means mounted on said housing and on said tool support forcausing movement of said housing along said path and for interrupt ingmovement of said housing, and other electric control meansconnected tothe means controlling movement of the tool support through an are forcausing said tool to move in an are.

9. A contour forming apparatus including a supporting base member havinga slide support thereon, a first housing slidably mounted on said slidesupport for movement along one path, a tool slide mounted on saidhousing and movable along a path transverse to the direction ofmovementof-said housing, a rotatable tool support on said tool slide, a contourslide mounted within said housing, a contour cam and a feed cam mountedon said contour slide, an intermediate slide connected between saidcontour cam and said tool slide, and a fluid pressure operated mechanismmounted on said housing for controlling movement of said housing andsaid tool slide and connected to said contour slide, a second housingmounted on said tool slide, fluid pressure operated mechanism connectedto said rotatable tool support for rotating said tool through an arc,electric control means'mounted in each of said housings and including aplurality of switch members connected to said fluid pressure operatedmechanisms, said contour slide having means for'operating the switchmembers within said first housing ina predetermined order forcontrolling movement of said housing along said path and forinterrupting saidmovement, and means on the fluid pressure operatedmechanism connected to said rotatable tool support for alternatelycontacting the switches in said second housing forcontrolling movementof said tool through said are and for controllingcontinued movement ofsaid housing.

10; Apparatus for forming a contour on a grinding wheel including asupporting base member having a slide support thereon, a first housingslidably mounted on said slide support for movement along a path, a toolslide mounted within said housing and movable along a path transversetothe direction of movement of said housing, a rotatable tool supportmounted on said tool slide, a contour slide mounted within said housingand movable parallel vtosaid tool slide, a contour cam and a. feed cammounted on said contour slide, an intermediate slide connected betweensaid contour cam and said tool slide, a fixed follower mounted on saidbase and contacting said feed cam for controlling movement of saidhousing, a firstprime mover mounted on said housing for controllingmovement of said housing and connected to said contour slide, a secondhousing mounted on said tool slide, a second prime mover in said secondhousing connected to said rotatable tool support for rotating saidtoolsupport through an arc, control means connected to said first primemover, control means connected to said second prime mover and means ineach of said housings for operating both of said control means forcontrolling movement of said tool through said are and for controllingmovement of said housing.

11. Apparatus for forming a contour on a grinding wheel including asupporting base member having a slide support thereon, a movable memberslidably mounted .on said slide support for movement along a path, atool slide mounted on said movable member and movable along a pathtransverseto the direction of movement of said movable member, arotatable tool support mounted on said tool slide, a contour slidemounted on said movable member and movable parallel to said tool slide,a contour cam and a'feed cam mounted on said contour slide, anintermediate slide connected between said contour camand said toolslide, a fixed follower mounted on said base member and contacting saidfeed cam for controlling movement of said movable member; a first meansmounted on said movable member for controlling movement of said movablemember and connected to said contourslide, a housing mounted on saidtool slide, a second means in said housing and connected to said toolsupport for rotating said tool support through' an arc, electric controlmeans for said first means mounted'onsaid movable member and electriccontrol means in said housing for said second means, and means on saidmovable means and said housing for operating both-of said electriccontrol means for controlling movement of said tool through said are andfor controllingmovement of said movable member.

12. Apparatus for forming a contour on a grinding wheel including asupporting base member having a slidesupport thereon, a first housingslidably mounted on said slide support for movement along one path, atool slide mounted on said housing and movable along a path transverseto the direction of movement of said housing, a rotatable tool supporton said tool slide, a contour slide mounted within said housing, acontour cam and a feed cam mounted on said contour slide, anintermediate slide connected between said contour cam and said toolslide, and a fluid pressure operated mechanism mounted on said housingfor controlling movement of said housing and said tool slide andconnected to said contour slide, a second housing mounted on said toolslide, fluid pressure operated mechanism connected to said rotatabletool support for rotating said tool through an arc, electricallycontrolled solenoid valves connected to said fluid pressure operatedmechanism, electric control means mounted in each of said housings andincluding a plurality of switch members and connected to saidelectrically controlled solenoid valves, said contour slide having meansfor operating the switch members within said first housing in apredetermined order for controlling movement of said housing along saidpath and for interrupting said movement, and means on the fluid operatedmechanism connected to said rotatable t-ool support for alternatelycontacting the switches in said second housing for controlling movementof said tool through said are and for controlling continued movement ofsaid housing.

13. Apparatus for forming a contour on a grinding wheel including asupporting base member having a slide support thereon, a first housingslidably mounted on said slide support for movement along a path, a toolslide mounted within said housing and movable along a path transverse tothe direction of movement of said housing, a rotatable tool supportmounted on said tool slide, a contour slide mounted within said housingand movable parallel to said tool slide, a contour cam and a feed cammounted on opposite sides of said contour slide, an intermediate slideconnected between said contour cam and said tool slide, a fixed followermounted on said base and contacting said feed cam for controllingmovement of said housing, and a first fluid pressure operated mechanismmounted on said housing for controlling movement of said housing andconnected to said contour slide, a second housing mounted on said toolslide, a second fluid pressure operated mechanism in said second housingconnected to said tool support for rotating said tool support through anarc, electrically controlled solenoid valves connected to each of saidfluid pressure operated mechanisms, electric control means mounted insaid first housing and connected to said electrically controlledsolenoid valves, electric control means in said second housing connectedto said electrically controlled solenoid valves, means on said contourslide and means on said second fluid pressure operated means foroperating said electric control means for controlling movement of saidtool through said are and for controlling movement of said housing.

14. Apparatus for forming a contour on a grinding Wheel including asupporting base member having a slide support thereon, a first housingslidably mounted on said slide support for movement along a path, a toolslide mounted within said housing and movable along a path transverse tothe direction of movement of said housing, a rotatable tool supportmounted on said tool slide, a contour slide mounted Within said housingand movable parallel to said tool slide, a contour cam and a feed cammounted on opposite sides of said contour slide, an intermediate slideconnected between said contour cam and said tool slide, a fixed followermounted on said base and contacting said feed cam for controllingmovement of said housing, and a first fluid pressure operated mechanismmounted on said housing for controlling movement of said housing andconnected to said contour slide, a second housing mounted on said toolslide, a second fluid pressure operated mechanism in said second housingconnected to said tool support for rotating said tool support through anarc, electrically controlled solenoid valves connected to each of saidfluid pressure operated mechanisms, electric control means mounted insaid first housing and connected to said electrically controlledsolenoid valves, electric control means in said second housing connectedto said electrically controlled solenoid valves, means on said contourslide and means on said second fluid pressure operated means foroperating said electric control means for controlling movement of saidtool through said are and for controlling movement of said housing, saidelectric control means including switches and said means on said contourslide and means on said second fluid pressure operated means includingdogs and a block.

15. Apparatus for forming a contour on a grinding wheel including asupporting member, a housing slidably mounted on said supporting memberfor movement in one direction, a tool support, a slide rotatablysupporting said tool support and mounted on said housing and movable ina direction transversely of the movement of said housing, means withinsaid housing and means on said supporting member contacting said lastmeans for controlling movement of said housing and the slide supportingsaid tool support, means for moving said housing and other means mountedon said slide for moving said tool support through an arc, control meansmounted on said housing and connected to the means for moving saidhousing for causing movement of said housing in said one direction andfor interrupting movement of said housing, and other control means onsaid slide and connected to the means for moving said tool support forcausing said tool support to move in an arc.

References Cited in the file of this patent UNITED STATES PATENTS

